Abstract
The effects of lugworm protein hydrolysate-containing proteins of differing molecular weights on permanent wave treatment of damaged hair were investigated. A protease-coenzyme obtained by culturing B. subtilis K-54 extracted from Cheonggukjang (fermented soybean paste stew) was added during the preparation of the lugworm protein hydrolysate. In particular, lugworm protein hydrolysates containing proteins of differing molecular weights were obtained by controlling the amount of added protease coenzyme. Each protein hydrolysate was then used as a pre-treatment agent for permanent wave treatment on permed hair or bleached hair and the thickness, density, and tensile strength of the hair, and wave-forming ability and durability were measured. The results indicated that an optimal level of decomposition of the lugworm protein facilitates the prevention of hair damage induced by permanent wave treatments.
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